Stop mechanism for engine-lathes



(No Model.)

E. EARLE. STOP MEGHANISM'FOR'ENGINE LALEES.V

No. 590,73'6, Patented Sept. 28,1897. l

UNITED STATES muon.

PATEN STOP lM ECHANISIVI FOR E NVGINE-LATHES.

SPECIFICATION forming part of Letters Patent No. 590,736, dated September 2.8, 1897.

Application iiled June 1,1897. Serial No; 6378,872. (No model.)

To all whom it may concern: y

Be it known that I, EN'ocH EARLLL a citizen of the United States, residing at Worcester, in the county of Worcester and State of Massachusetts, have invented a new and usev cient means for stopping the feed of the toolcarriage accurately at any given position, so that the cutting of the tool can be checked instantly and exactly at any desired point'on the work. This object I attain by the mechanism illustrated in the drawings, wherein- Figure l is a front viewof an engine-lathe having my invention appliedthereto. '.Fig

2 is alongitudinal section of myimprbve'd".

stop mechanism at line X X, Fig. 3. Fig. 3 is a top plan view of the same. Fig. 4 lis a transverse section at line Y Y, Fig. 3; and Fig. 5 is a side view of the internal parts.

Referring to parts, A denotespan enginelathe of usual or any desirable construction to which the stop mechanism is applicable. a and a are the usual head-stock and tailstock for supporting'the work. B denotes the longitudinally-grooved feedrod passing through the apron Cof the mov? able rest or carriage C on which the tool-post and cutting-tool are arranged. The movement of the carriage is effected in the usual manner by mechanism withinI the apronO, which it is not necessaryherein to illustrate further than to show the worm-'gear D, which receives motion from the rotation of the feedrod B, as allsuch mechanism is of well-known construction and operation.

My invention consists in the following-described mechanism and in the combination thereof with the feed-rod and apron of an en-` gine-lathe. Upon the rod or shaft B,I arrange a tubular endwise-movable slide E, having secured to its inner'end a`cl`utch-sleeveY F, with teeth which face toward the outer end of said slide. A shoe or supporting-box His provided therefor, havin g at one end a chambered bearing h, that lits the` shouldered end of the slide E, and at its other end a bearing h', in which the feed-rod turns, while the central portion is preferably formed as a semicircular shell, affording a hollow or cavity G suitable for containing oil. The front of the boX H is properly itted and secured to the apron C by the bolt d. The worm I', which engages the worm-wheel D, is formed upon the end of a hollow sleeve I, a portion of which ts on the feed-rod and a portion of which is chambered at fand extends over the clutch-sleeve F and has secured in its end a clutch-ring J, the teeth of which are faced inward andare formed to engage with the teeth on the sleeve F. Said ring .I is fixed in theMworm-sleeve I by the screw-pins or in other suitable manner. The worm-sleeve is loose'on the shaft or rod B, sc that the latter canhturn freely within it, while saidwormsleeve and clutch-ring Yfit between the inner ends of the bearings h and h and are thereby sustained against endwise movement. The clutch-sleeve F is permitted sufficient endwise movement within the chamber f to release and engage the teeth, and said clutching parts vare normally pressed towardv their engaged'positionby an expanding coil-spring K, disposed within the chambered bearing 7i and acting against a shoulder c on the tubular slide E, as indicated in Figs.` 2 and 5. The clutch-sleeve F has a spline or key that slides 'in the groove t and causes said sleeve to rotate with the feed-rod B. The end of the tubular slide E projects from the bearing h, as indicated. An adjustable collar M is fitted on the shaft or rod B and provided with a suitable clamping bolt or device m, whereby 4it can be rigidly set atv any desired'position along the rod. The end of said collar is fitted to contact against the end of the slide E.

'In the operation when the apron C and toolcarriage are away from the collar M the sleeve F and ringJ are held normally in clutch, and the worm I is thereby rotated with the feedrod B and operates the feed mechanism through revolution of the worm-wheel D. When it is desired to stop the cut of the tool 'at any desired point on the work, as the collar M is adjusted at a corresponding position and clamped on the feed-rod. Then as IOO the carriage moves up toward the head of the lathe the end of the slide E strikes the collar and is thereby resisted, the further advance of the carriage forcingback the clutch-sleeve F and disengaging its teeth from those of ring J. The instant the teeth become separated the worm I stops rotating, as the rod turns free Within it. This stop is instantaneous and can be effected with accuracy at any position on the Work, as desired. lhen the carriage is moved down to take a new cut, the spring K automatically throws the clutch into rengagement.

W'hat I claim as of my invention, and desire to secure by Letters Patent, is-

l. The combination with the shaft or feedrod and the supporting-box having the bearings thereon; of the tubular slide having the clutch-sleeve thereon, the Wormsleeve extending over said clutch-sleeve and carrying the inwardly-toothed clutch-ring7 the spring pressing outward on said slide, and the adjustable collar adapted for contact with said slide, substantially as set forth.

E2. The combination, with the carriageapron in an engine-lathe, its feed-rod, and worm-gear that operates the feed mechanism; of the su pport-box attached to the apron and having bearings through which the feed-rod passes, the tubular endWise-movable slide and clutch-sleeve splined to rotate with said rod, the Worm arranged on a Wor1n-sleeve r0- tatively loose on said rod, and carrying the clutch-ring, said worm-sleeve and clutch-ring supported against cndwise displacement, the expansion-spring acting to normally engage the clutch, and the collar ad justably held on said feed-rod7 for the purposes set forth.

lVitness my hand this 27th day of May, A. D. 1897.

ENOCII EARLE.

XVitnesses:

CHAs. H. BURLEIGH, CHARLES S. BACON. 

